Abstract: A numerical control system comprising a numerical control device, a machine tool for machining a workpiece under the control of the numerical control device, and a robot for executing various tasks such as mounting the workpiece on the machine tool or demounting the workpiece therefrom. The numerical control device, in addition to the hardware which it possesses for controlling the machine tool, is further provided with a teaching control panel, a heavy current circuit which handles the exchange of data between the numerical control device and the robot, and a switching control circuit for switching over the output side of a pulse distributing circuit so that the pulse distributing circuit can be used in controlling both the robot and the machine tool. Machining data for control of the machine tool and data for commanding the robot are stored in a memory device incorporated in the numerical control device, or in a storage medium which is located externally of the system.

Abstract: A photo-curable coating composition for building materials which comprises(a) an isocyanate-modified epoxy ester obtained by the reaction of an acrylic or methacrylic ester of an epoxy compound having not less than two epoxy groups in the molecule with a polyisocyanate;(b) a photopolymerizable monomer being copolymerizable with the epoxy ester (a);(c) a ketone resin;(d) a photo-sensitizer; and(e) a sensitizing auxiliary.

Abstract: A control system for driving a rotary shaft and for positioning the shaft at a commanded position with one motor and two rotation transmission mechanisms of different ratios provided between the motor and the rotary shaft. The two transmission mechanisms are adapted to be selectively actuated to transmit the rotation of the motor to the rotary shaft. The rotary shaft is positioned at a commanded position using a feedback signal from a rotational position detector irrespective of which one of the two transmission mechanisms is employed.

Abstract: A numerically controlled machine tool controls the movement of a tool relative to a workpiece along a commanded path to cut the workpiece and to detect a load on the tool or workpiece. A specified position or section on the commanded path is the point at which the load on the tool or workpiece is detected and stored. Subsequently, the load on the tool or workpiece is detected each time the tool passes through the specified position or section and this detected value is compared with the above stored content. When the difference is larger than a predetermined value, an alarm signal is produced to indicate that the tool has worn out.

Abstract: A numerical control unit in which command data is inputted from a keyboard and stored in an internal memory and which controls a machine tool based on the stored command data. A cassette type memory is constructed to be detachably mounted on the numerical control unit. When the cassette type memory is mounted on the numerical control unit, the command data can be transmitted between the cassette type memory and the internal memory and stored therein and even when the cassette type memory is removed from the numerical control unit, the stored content can be retained. By repeatedly reading out the command data stored in the cassette type memory, the machine tool can be controlled.

Abstract: A water-soluble coating composition for ship bottom comprising(A) 70 - 95 parts by weight of a vinyl copolymer of(a) 5 - 40% by weight of monoethylenic unsaturated monomer having at least one basic nitrogen atom,(b) 5 - 40% by weight of monoethylenic unsaturated monomer having at least one amide group, and(c) at least one monoethylenic unsaturated monomer copolymerizable with the said components (a) and (b), a total of the components (a), (b) and (c) being 100% by weight, and(B) 30 - 5 parts by weight of a water-soluble epoxy compound, shows excellent effect on controlling release rate of the toxic material from the primer coating layer and on inhibiting adhesion of marine organisms to ship bottoms, when applied to the primer coating layer of ship bottoms.

Abstract: A converter converts numerical data of unit length indicating instructions for moving a component in directions of first and second coordinates to a number of pulses of minor resolution. An interpolator coupled to the converter interpolates the pulses of minor resolution to provide distribution pulses of minor resolution. A mover coupled to the interpolator moves the component in directions of one of the coordinates in minor resolution. A divider coupled to the interpolator converts the number of pulses of minor resolution to the lesser number of pulses of major resolution and a mover coupled to the divider moves the component in directions of the other of the coordinates in major resolution.